Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1983-01-20
1984-01-17
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277188A, 277208, 251214, F16J 1520, F16K 4104
Patent
active
044260938
ABSTRACT:
An improved stem packing. In the preferred and illustrated embodiment, the packing for the stem is captured within a housing normally described as a bonnet assembly, and is axially loaded by a cooperative jam nut and bushing. They axially load the top end of the stem packing, forcing it to expand radially inwardly and outwardly to grip the stem to seal against stem and bonnet surfaces. Extrusion of packing material typically occurs. The improved version of stem packing apparatus in the preferred and illustrated embodiment is a tubular sleeve of relatively elongate lubricated plastic material having a plurality of partial circumferential parallel cuts in it, thereby decreasing the axial load required to achieve sealing. The seal material controllably expands controlled by the cuts, thereby achieving the desired internal and external seal to prevent leakage. Torque required to rotate the stem is reduced, and extrusion of the seal material is markedly reduced.
REFERENCES:
patent: 2097016 (1937-10-01), Bowen
patent: 2717273 (1955-09-01), Anderson
patent: 3206165 (1965-09-01), Salmon et al.
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